This question is an exact duplicate of:
I have a Windows 8 system with an nVidia 660 video card connected over HDMI to my Vizio television, which is connected via optical output to a 5.1 system.
I cannot get my computer to output 5.1 in this configuration, and I believe it's because my Vizio is reporting itself as a 2 channel device, so Windows will only output 2 channel to it.
I know if I force 5.1 on a PS3 or 360 connected to the TV, my 5.1 system receives all 5.1 channels.
How can I force Windows or my nVidia card to output 5.1? For reference, here's my sound properties pane:
- My 5.1 system is actually a soundbar, and my TV has all the HDMI inputs - to save swapping cables I have to go through the TV
- This may look like a duplicate, but that's because I asked the question already here where it was falsely marked as a duplicate - I can't install ATI drivers for my nVidia card.